API error at the beginning of filer backups

[sanadmin_do]

We have been using snapdiff backups for our SVMs for years. We use IBM Storage Protect (latest version) and Data ONTAP 9.13.1.P7. The following messages keep appearing in the audit log of our cluster: 'Unable to find API: vfiler-list-info on data vserver SVM_xxx'. The message always appears when the backup of a filer volume starts. When we search for the error, we only ever find very old references to 7-mode. Is there a way to deactivate the message under ONTAP?

[dahoff]

same error in our netapp audit logs. we also do tsm/ibm Storage Protect backups.

Our Backups seem to work, but the "error-unknown-api" Error in the audit logs are there every night.
(User=our TSM backup user, Application=ontapi, State=Error, Additional information=Unable to find API: vfiler-list-info on data vserver xxOurVserver/SVMxx)

I would like to have TSM using the new REST-API, so i call DSMC.exe with -snapdiff -snapdiffhttps switches applied.
I assume, that the backup via REST-API isn´t working properly and still using ontapi/zapi.

Any insides into this error and its cause? Documentation is very sparse on the matter.